229 research outputs found
Hydrological influence on the evolution of a subtropical mangrove ecosystem during the late Holocene from Babitonga Bay, Brazil
Mangroves are key ecosystems which respond to global changes in tropical and subtropical regions worldwide. We describe late Holocene mangroves that established close to the southernmost limit (28°S) for this type of ecosystem in South America. Our findings are based on a C dated core obtained from Babitonga Bay, Santa Catarina State, Brazil (26°12′S, 48°33′W). Analysis of palynology, sedimentary facies, isotopic and elemental data shows that mangrove establishment took place ~500 yrs. B.C.E., following an increase in humidity, and expanded further during the Roman Warm Period and at the end of Dark Age Cold Period. Mangrove and precipitation proxies records appear to be sensitive to rainfall patterns imposed both by the expansion/retraction of the Intertropical Convergence Zone and also the interaction with the South Atlantic Subtropical Anticyclone which affects coastal region due to sea surface temperature variations.The authors thank the Coastal Dynamic Laboratory (LADIC-UFPA) , C-14 Laboratory of the Center for Nuclear Energy in Agriculture (CENA-USP) , University of Joinville (UNIVILLE) and Radiocarbon Laboratory (LAC-UFF) for all infrastructure and support. We also thank three anonymous Reviewers and Prof. H. Falcon-Lang for their constructive comments. The first and third author thanks Brazilian Council for Technology and Science-CNPq for fellowship (process 131813/2016-1 , 165911/2015-8 and 305074/2017-2 ). This study was financed by CNPq ( 445111/2014-3 , 405060/2013- 0 ) and FAPESP ( 2011/00995-7 , 2017/03304-1, and 2020/13715-1 ). This study also was financed in part by the Coordenação de Aperfeiçoamento de Pessoal Nível Superior – Brazil (CAPES) – Finance Code 001
Common Proper Motion Search for Faint Companions Around Early-Type Field Stars - Progress Report
The multiplicity of early-type stars is still not well established. The
derived binary fraction is different for individual star forming regions,
suggesting a connection with the age and the environment conditions. The few
studies that have investigated this connection do not provide conclusive
results. To fill in this gap, we started the first detailed
adaptive-optic-assisted imaging survey of early-type field stars to derive
their multiplicity in a homogeneous way. The sample has been extracted from the
Hipparcos Catalog and consists of 341 BA-type stars within ~300 pc from the
Sun. We report the current status of the survey and describe a Monte-Carlo
simulation that estimates the completeness of our companion detection.Comment: 4 pages, 1 figure, conference proc. Syros 200
Determination of non-isothermal crystallization rate constant of a rotational molding grade LLDPE
Processo de municipalização: uma avaliação do nível de informação dos profissionais de saúde das Unidades Básicas da região oeste do município de Londrina - Paraná
Contribuição da heterogeneidade de linhas de regressão para a recomendação de novas cultivares
Acumulação de biomassa e extração de nutrientes por plantas de feijão-de-corda irrigadas com água salina em diferentes estádios de desenvolvimento
Thermal comfort in reduced models of broilers' houses, under different types of roofing materials
- …